/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/GameplayEffect.h
Receive a notify that this GameplayEffect has been added to an Active Container. ActiveGE will be the Active version of this GameplayEffect. Returns true if this GameplayEffect should be active (or false to inhibit).
bool OnAddedToActiveContainer ( [FActiveGameplayEffectsContainer](API\Plugins\GameplayAbilities\FActiveGameplayEffectsContainer) & ActiveGEContainer, [FActiveGameplayEffect](API\Plugins\GameplayAbilities\FActiveGameplayEffect) & ActiveGE ) const